.page-faq {
  --faq-rail: 244px;
  --faq-gap: clamp(28px, 4.5vw, 64px);
  --faq-soft: rgba(184, 137, 60, .18);
}

/* ---------- 首屏 ---------- */

.page-faq .faq-hero {
  position: relative;
  margin-top: clamp(18px, 2.6vw, 30px);
  padding: clamp(26px, 4.6vw, 58px);
  border: 1px solid var(--line);
  background:
    linear-gradient(138deg, rgba(74, 12, 22, .95) 0%, rgba(74, 12, 22, .5) 44%, rgba(14, 7, 10, .98) 80%);
  overflow: hidden;
}

.page-faq .faq-hero::before,
.page-faq .faq-hero::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
}

.page-faq .faq-hero::before {
  width: clamp(220px, 30vw, 420px);
  aspect-ratio: 1;
  right: -12%;
  top: -38%;
  border: 1px solid var(--line);
}

.page-faq .faq-hero::after {
  width: clamp(130px, 18vw, 250px);
  aspect-ratio: 1;
  right: 6%;
  top: -14%;
  border: 1px dashed rgba(184, 137, 60, .3);
}

.page-faq .hero-kicker {
  position: relative;
  margin: 0 0 14px;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--gold);
}

.page-faq .faq-hero h1 {
  position: relative;
  margin: 0;
  max-width: 20ch;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 5.6vw, 62px);
  line-height: 1.12;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-faq .hero-lede {
  position: relative;
  margin: clamp(18px, 2.4vw, 26px) 0 0;
  max-width: 60ch;
  font-size: clamp(15px, 1.25vw, 17px);
  line-height: 1.8;
  color: rgba(243, 231, 214, .82);
}

.page-faq .faq-facts {
  position: relative;
  list-style: none;
  margin: clamp(24px, 3vw, 34px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--faq-soft);
  border: 1px solid var(--faq-soft);
}

.page-faq .faq-facts li {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 14px 16px;
  background: rgba(14, 7, 10, .86);
}

.page-faq .fact-num {
  font-family: var(--font-data);
  font-size: clamp(18px, 2vw, 22px);
  font-weight: 700;
  color: var(--gold-hi);
  line-height: 1.1;
}

.page-faq .fact-label {
  font-size: 12.5px;
  letter-spacing: .06em;
  color: var(--mist);
}

/* ---------- 主体骨架 ---------- */

.page-faq .faq-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--faq-gap);
  margin-top: clamp(32px, 5vw, 64px);
}

.page-faq .faq-rail {
  border-top: 1px solid var(--line-strong);
  padding-top: 14px;
}

.page-faq .rail-title {
  margin: 0 0 12px;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--gold);
}

.page-faq .rail-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.page-faq .rail-list a {
  display: flex;
  align-items: baseline;
  gap: 9px;
  padding: 10px 12px;
  border: 1px solid var(--faq-soft);
  font-size: 13.5px;
  line-height: 1.4;
  color: var(--paper);
  text-decoration: none;
  transition: border-color .25s var(--ease), color .25s var(--ease), background-color .25s var(--ease);
}

.page-faq .rail-list a:hover,
.page-faq .rail-list a:focus-visible {
  border-color: var(--gold-hi);
  color: var(--gold-hi);
  background: rgba(168, 20, 40, .18);
}

.page-faq .rail-num {
  flex: none;
  font-family: var(--font-data);
  font-size: 11.5px;
  letter-spacing: .05em;
  color: var(--gold);
}

.page-faq .faq-flow {
  min-width: 0;
}

/* ---------- 分组 ---------- */

.page-faq .faq-group {
  padding-top: clamp(24px, 3.4vw, 40px);
  border-top: 1px solid var(--line);
  scroll-margin-top: calc(var(--header-h) + 26px);
}

.page-faq .faq-group + .faq-group {
  margin-top: clamp(44px, 6vw, 92px);
}

.page-faq .group-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  column-gap: 16px;
  align-items: start;
  margin-bottom: clamp(16px, 2.2vw, 24px);
  padding-bottom: 14px;
  border-bottom: 1px solid var(--faq-soft);
}

.page-faq .group-num {
  font-family: var(--font-data);
  font-weight: 700;
  font-size: clamp(26px, 4.4vw, 40px);
  line-height: 1;
  color: var(--gold);
  opacity: .8;
}

.page-faq .group-title {
  margin: 0;
  align-self: center;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(21px, 2.8vw, 30px);
  line-height: 1.25;
  color: var(--paper);
}

.page-faq .group-sum {
  grid-column: 2 / -1;
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 配图 ---------- */

.page-faq .faq-figure {
  margin: 0 0 clamp(16px, 2.2vw, 22px);
  padding: 8px;
  border: 1px solid var(--line);
  background: rgba(243, 231, 214, .03);
}

.page-faq .faq-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 问答折叠 ---------- */

.page-faq .qa-list {
  display: grid;
  gap: 10px;
  padding-left: clamp(14px, 1.6vw, 22px);
  border-left: 1px solid var(--line);
}

.page-faq .qa {
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(21, 10, 14, .92), rgba(14, 7, 10, .92));
  transition: border-color .25s var(--ease), transform .25s var(--ease), box-shadow .25s var(--ease);
}

.page-faq .qa:hover {
  border-color: var(--gold-hi);
  transform: translateY(-2px);
}

.page-faq .qa[open] {
  border-color: var(--gold-hi);
  box-shadow: inset 3px 0 0 0 var(--gold-hi);
}

.page-faq .qa summary {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 15px 18px;
  cursor: pointer;
  list-style: none;
  color: var(--paper);
  font-size: clamp(15px, 1.3vw, 16.5px);
  font-weight: 600;
  line-height: 1.6;
}

.page-faq .qa summary::-webkit-details-marker {
  display: none;
}

.page-faq .qa summary:focus-visible {
  outline: 2px solid var(--gold-hi);
  outline-offset: -2px;
}

.page-faq .qa summary::after {
  content: "+";
  margin-left: auto;
  flex: none;
  font-family: var(--font-data);
  font-size: 18px;
  line-height: 1.3;
  color: var(--gold);
  transition: color .25s var(--ease);
}

.page-faq .qa[open] summary::after {
  content: "–";
  color: var(--gold-hi);
}

.page-faq .qa-index {
  flex: none;
  padding-top: 3px;
  font-family: var(--font-data);
  font-size: 11.5px;
  letter-spacing: .06em;
  color: var(--gold);
}

.page-faq .qa[open] .qa-index {
  color: var(--pulse);
}

.page-faq .qa-a {
  padding: 0 18px 18px 42px;
  font-size: 15.5px;
  line-height: 1.78;
  color: rgba(243, 231, 214, .74);
}

.page-faq .qa-a p {
  margin: 0;
  max-width: 64ch;
}

/* ---------- 组尾指向 ---------- */

.page-faq .group-next {
  margin: 16px 0 0;
  padding: 10px 14px;
  border-left: 2px solid var(--red);
  background: rgba(168, 20, 40, .12);
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--mist);
}

.page-faq .group-next a {
  color: var(--gold-hi);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  transition: border-color .25s var(--ease), color .25s var(--ease);
}

.page-faq .group-next a:hover,
.page-faq .group-next a:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--gold-hi);
}

/* ---------- 收尾 ---------- */

.page-faq .faq-outro {
  margin-top: clamp(40px, 6vw, 84px);
  padding: clamp(22px, 3vw, 34px);
  border: 1px solid var(--line);
  background: linear-gradient(120deg, rgba(74, 12, 22, .58), rgba(14, 7, 10, .92) 72%);
  display: grid;
  gap: 18px;
  justify-items: start;
}

.page-faq .outro-text {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(243, 231, 214, .8);
}

/* ---------- 响应式 ---------- */

@media (min-width: 720px) {
  .page-faq .faq-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-faq .faq-outro {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
}

@media (min-width: 1024px) {
  .page-faq .faq-shell {
    grid-template-columns: var(--faq-rail) minmax(0, 1fr);
    gap: clamp(32px, 4vw, 72px);
  }

  .page-faq .faq-rail {
    position: sticky;
    top: calc(var(--header-h) + 28px);
    align-self: start;
    max-height: calc(100vh - var(--header-h) - 56px);
    overflow-y: auto;
  }

  .page-faq .rail-list {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-faq .group-title {
    font-size: clamp(24px, 2.1vw, 32px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-faq .qa,
  .page-faq .rail-list a,
  .page-faq .group-next a {
    transition: none;
  }

  .page-faq .qa:hover {
    transform: none;
  }
}